Common small storm-petrel of the northern Humboldt Current (can be seen from shore in northern Chile) and Galapagos Islands (where often follows boats, pattering in the wake with long legs dangling). Flight rather weak and fluttery, unlike strong deep wingbeats of Wedge-rumped Storm-Petrel, which also follows boats in Galapagos. The long legs and feet of Elliot’s project past tip of tail, unlike Wedge-rumped. Plumage similar to the slightly larger Wilson’s Storm-Petrel (but note white belly of Elliot's), and are often not safely distinguished at sea.